Mechanically actuated fine point eraser



Nov. 18, 1947. A. w. WONDERS- 2,431,156

MECHANICALLY ACTUATED FINE POINT ERASER Filed Jan. 16, 1946 u Mm , 7 7nun Patented Nov. 18, 1947 MECHANICA'LLY ACTUATED FINE POINT ERASERAlvin W. Wonders, Gallup, N. Mex,

Application January 16, 1946, Serial'No. 641,433

10 Claims.

The invention as described herein, and illustrated in the accompanyingdrawings, appertains to novel and useful improvements in mechanicallyactuated erasers. An object of the invention is to provide means wherebylines, figures, etc., in crowded positions may be readily erased withouttouching other adjoining lines.

Another object of the invention is to provide an element having a spiralrecess in which a, cord type eraser is mounted and means whereby thesame may be gradually fed to an erasing position.

Another object of the invention is to provide a case in which isrotatably seated a core having a spiral groove from end to end thereof,a cord eraser seated in the groove and means whereby the eraser may befed through a pointed end of the case.

Other features and advantages will become more readily apparent from thefollowing description and the accompanying illustrative drawings inwhich:

Figure 1 is a sectional elevational view of the eraser,

Figure 2 is an elevational view of a core member,

Figure 3 is a vertical sectional view of a casing,

Figure 4 is an elevational view thereof,

Figure 5 is a sectional view on line 5-5 of Figure 3,

Figure 6 is a detail elevational view of a pusher ring,

Figure 7 is a plan View thereof, and

Figure 8 is a detail view of a rubber cord.

Referring now in detail to the accompanying drawing in which thepreferred form of the invention is illustrated, the invention as shownconsists of three members, a casing II, a core I2 and a cord rubber H3.The casing is cylindrical and at its lower end It tapers at I5 to areduced opening IS. The core is also cylindrical and is provided with aspiral groove ll extending from the upper end I 8 to the conicalterminal I!) through which the groove also extends to the said openingIii. The member [2 is provided with a knurled head 29 by means of whichit may be rotated within the said casing II. The rubber cord [3 is woundin the spiral ll with its terminal 2| projecting through the casingopening [6. Slidably mounted upon the core I2 and over the upper end ofsaid cord I3 is a circular band 22 through which projects a pin 23, oneend 24 extending within the band and upon the upper end 25 of the erasercord, while its other end 26 projects outwardly of the band and seatsslidably within an elongated vertical groove 21 formed in the innersurface 28 of the said member I I. Upon rotating 2 the core the spiralwill cause the band to move down while the pin 24 will push the corddown, the end 26 seating in said groove 21 will prevent rotation of theband with the said core.

From the foregoing it will be seen that an eraser is provided with arelatively very small erasing surface and by means of which closelyassociated lines or one line thereof may be erased without touchingadjoining lines.

Changes in shape, size and rearrangement of elements such as come withinthe purview of the invention claimed may be resorted to, in actualpractice, if desired, without departing from the spirit of theinvention.

Having now described the invention, that which is claimed to be new anddesired to be procured by Letters Patent is:

1. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiraL'means for movingthe cord down, a casing for the member having a tapered point with anaperture through which an end of the cord is adapted to project, saidmeans consisting of a circular band having a pin seating in the grooveabove the cord, said casing having a vertical inner groove and said pinalso projecting into the last groove, and means for rotating the memberto cause the pin to push down on the cord, said second groove adapted tohold the ring against rotation.

2. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiral, means for movingthe cord down, a casing for the member having a tapered point with anaperture through which an end of the cord is adapted to project, saidmeans consisting of a circular band having a pin seating in the grooveabove the cord, said casing having a vertical inner groove and said pinalso projecting into the last groove, and means for rotating the memberto cause the pin to push down on the cord.

3. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiral, means for movingthe cord down, a casing for the member havin a tapered point with anaperture through which an end of the cord is adapted to project, saidmeans consisting of a circular band having a pin seating in the grooveabove the cord, and said casing having a vertical inner groove and saidpin also projecting into the last groove.

4. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiral, means for an endof the cord is adapted to project, said.

means consisting of a circular band.

6. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiral, means for movingthe cord down, and a casing for the member having a tapered point withan aperture through which an end of the cord is adapted to project.

7. The described eraser comprising a cylindrical member having a spiralgroove therein and erasing means mounted in the spiral, means foractuating said erasing means, and a casing for the member having atapered point.

8. The described eraser comprising a cylindrical member having a spiralgroove therein and erasing means mounted in the spiral, means for movingsaid erasing means down, and a, casing for the member.

9. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiral, and means formoving the cord down.

10. The described eraser comprising a cylindrical member having a spiralgroove therein and a rubber cord mounted in the spiral,

ALVIN W. WONDERS.

